{"title":"Monopole Floer homology and invariant theta characteristics","authors":"Francesco Lin","doi":"10.1112/jlms.12895","DOIUrl":null,"url":null,"abstract":"<p>We describe a relationship between the monopole Floer homology of three-manifolds and the geometry of Riemann surfaces. For an automorphism <span></span><math>\n <semantics>\n <mi>φ</mi>\n <annotation>$\\varphi$</annotation>\n </semantics></math> of a compact Riemann surface <span></span><math>\n <semantics>\n <mi>Σ</mi>\n <annotation>$\\Sigma$</annotation>\n </semantics></math> with quotient <span></span><math>\n <semantics>\n <msup>\n <mi>P</mi>\n <mn>1</mn>\n </msup>\n <annotation>$\\mathbb {P}^1$</annotation>\n </semantics></math>, there is a natural correspondence between theta characteristics <span></span><math>\n <semantics>\n <mi>L</mi>\n <annotation>$L$</annotation>\n </semantics></math> on <span></span><math>\n <semantics>\n <mi>Σ</mi>\n <annotation>$\\Sigma$</annotation>\n </semantics></math> which are invariant under <span></span><math>\n <semantics>\n <mi>φ</mi>\n <annotation>$\\varphi$</annotation>\n </semantics></math> and self-conjugate <span></span><math>\n <semantics>\n <msup>\n <mtext>spin</mtext>\n <mi>c</mi>\n </msup>\n <annotation>${\\text{spin}}^c$</annotation>\n </semantics></math> structures <span></span><math>\n <semantics>\n <msub>\n <mi>s</mi>\n <mi>L</mi>\n </msub>\n <annotation>$\\mathfrak {s}_L$</annotation>\n </semantics></math> on the mapping torus <span></span><math>\n <semantics>\n <msub>\n <mi>M</mi>\n <mi>φ</mi>\n </msub>\n <annotation>$M_{\\varphi }$</annotation>\n </semantics></math> of <span></span><math>\n <semantics>\n <mi>φ</mi>\n <annotation>$\\varphi$</annotation>\n </semantics></math>. We show that the monopole Floer homology groups of <span></span><math>\n <semantics>\n <mrow>\n <mo>(</mo>\n <msub>\n <mi>M</mi>\n <mi>φ</mi>\n </msub>\n <mo>,</mo>\n <msub>\n <mi>s</mi>\n <mi>L</mi>\n </msub>\n <mo>)</mo>\n </mrow>\n <annotation>$(M_{\\varphi },\\mathfrak {s}_L)$</annotation>\n </semantics></math> are explicitly determined by the eigenvalues of the (lift of the) action of <span></span><math>\n <semantics>\n <mi>φ</mi>\n <annotation>$\\varphi$</annotation>\n </semantics></math> on <span></span><math>\n <semantics>\n <mrow>\n <msup>\n <mi>H</mi>\n <mn>0</mn>\n </msup>\n <mrow>\n <mo>(</mo>\n <mi>L</mi>\n <mo>)</mo>\n </mrow>\n </mrow>\n <annotation>$H^0(L)$</annotation>\n </semantics></math>, the space of holomorphic sections of <span></span><math>\n <semantics>\n <mi>L</mi>\n <annotation>$L$</annotation>\n </semantics></math>, and discuss several consequences of this description. Our result is based on a detailed analysis of the transversality properties of the Seiberg–Witten equations for suitable small perturbations.</p>","PeriodicalId":49989,"journal":{"name":"Journal of the London Mathematical Society-Second Series","volume":null,"pages":null},"PeriodicalIF":1.0000,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the London Mathematical Society-Second Series","FirstCategoryId":"100","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1112/jlms.12895","RegionNum":2,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATHEMATICS","Score":null,"Total":0}
引用次数: 0
Abstract
We describe a relationship between the monopole Floer homology of three-manifolds and the geometry of Riemann surfaces. For an automorphism of a compact Riemann surface with quotient , there is a natural correspondence between theta characteristics on which are invariant under and self-conjugate structures on the mapping torus of . We show that the monopole Floer homology groups of are explicitly determined by the eigenvalues of the (lift of the) action of on , the space of holomorphic sections of , and discuss several consequences of this description. Our result is based on a detailed analysis of the transversality properties of the Seiberg–Witten equations for suitable small perturbations.
期刊介绍:
The Journal of the London Mathematical Society has been publishing leading research in a broad range of mathematical subject areas since 1926. The Journal welcomes papers on subjects of general interest that represent a significant advance in mathematical knowledge, as well as submissions that are deemed to stimulate new interest and research activity.